%0 Journal Article %T Silicene vs. ordered 2D silicide: the atomic and electronic structure of the Si-$(\sqrt{19}\times\sqrt{19})R23.4^{\circ}$/Pt(111) surface reconstruction %A Martin Svec %A Prokop Hapala %A Martin Ondracek %A Maria Blanco-Rey %A Pablo Merino %A Pingo Mutombo %A Martin Vondracek %A Yaroslav Polyak %A Vladimir Chab %A Jose Angel Martin Gago %A Pavel Jelinek %J Physics %D 2014 %I arXiv %R 10.1103/PhysRevB.89.201412 %X We discuss the possibility of a 2D ordered structure formed upon deposition of Si on metal surfaces. We investigate the atomic and electronic structure of the Si-$(\sqrt{19}\times\sqrt{19})R23.4^{\circ}$/Pt(111) surface reconstruction by means of a set of experimental surface-science techniques supported by theoretical calculations. The theory achieves a very good agreement with the experimental results and corroborate beyond any doubt that this phase is a surface alloy consisting of Si$_3$Pt tetramers that resembles a twisted Kagome lattice. These findings render unlikely any formation of silicene or germanene on Pt(111) and other transition metal surfaces. %U http://arxiv.org/abs/1402.7275v2